JP6744911B2 - Information management device for injection molding and injection molding machine - Google Patents

Description

The present invention relates to an injection molding information management device and an injection molding machine.

The molding machine described in Patent Document 1 performs mold closing, mold clamping, and mold opening by advancing and retracting a movable die plate on which a movable mold is mounted by a driving force of a mold opening/closing servomotor. This molding machine has a controller that, when the output torque of the mold opening/closing servomotor exceeds the determination torque during mold opening, determines that the mold opening is abnormal and stops the mold opening operation.

Japanese Patent Laid-Open Publication No. 2009-166465

The injection molding machine has a movable part and a drive part for moving the movable part.

Conventionally, an abnormality of the injection molding machine was detected based on the driving force of the drive unit while the movable unit was moving, but the moving speed of the movable unit is changed according to the mold device and molding material. However, it was difficult to deal with various molding conditions.

The present invention has been made in view of the above problems, and its main object is to provide an information management apparatus for injection molding, which can detect deterioration of parts under various molding conditions.

To solve the above problems, according to one embodiment of the present invention,
An information management device for injection molding, which manages information of parts of an injection molding machine having a movable part, a drive part for moving the movable part, and a drive force detection part for detecting a drive force of the drive part. ,
An information management device for injection molding is provided, which detects deterioration of parts of the injection molding machine based on a detection value of the driving force detection unit while the movable unit is stopped.

According to one aspect of the present invention, there is provided an injection molding information management device capable of detecting deterioration of parts under various molding conditions.

It is a figure which shows the state at the time of completion of mold opening of the injection molding machine by one Embodiment. It is a figure which shows the state at the time of mold clamping of the injection molding machine by one Embodiment. It is a figure which shows the time change of the position of the crosshead by one Embodiment. It is a figure which shows the operation|movement of the compression molding of the mold clamping apparatus by one Embodiment. It is a figure which shows the time change of the position of a crosshead in the compression molding of the mold clamping apparatus by one Embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each of the drawings, the same or corresponding components will be denoted by the same or corresponding reference numerals and description thereof will be omitted.

FIG. 1 is a diagram showing a state at the time of completion of mold opening of an injection molding machine according to an embodiment. FIG. 2 is a diagram showing a state when the injection molding machine according to the embodiment is clamped. As shown in FIGS. 1 and 2, the injection molding machine includes a frame Fr, a mold clamping device 10, an injection device 40, an ejector device 50, and a control device 90.

In the following description, the moving direction of the movable platen 13 when the mold is closed (rightward in FIGS. 1 and 2) is the front, and the moving direction of the movable platen 13 when the mold is opened (left in FIGS. 1 and 2) is the direction. This will be described as the rear.

The mold clamping device 10 performs mold closing, mold clamping, and mold opening of the mold device 30. The mold clamping device 10 is, for example, a horizontal mold whose opening/closing direction is horizontal. The mold clamping device 10 includes a fixed platen 12, a movable platen 13, a toggle support 15, a tie bar 16, a toggle mechanism 20, a mold clamping motor 25, and a motion conversion mechanism 26.

The fixed platen 12 is fixed to the frame Fr. A fixed mold 32 is attached to a surface of the fixed platen 12 facing the movable platen 13.

The movable platen 13 is movable along a guide (for example, a guide rail) 17 laid on the frame Fr, and is movable back and forth with respect to the fixed platen 12. The movable mold 33 is attached to the surface of the movable platen 13 facing the fixed platen 12.

By moving the movable platen 13 back and forth with respect to the fixed platen 12, mold closing, mold clamping, and mold opening are performed. The fixed mold 32 and the movable mold 33 constitute a mold device 30.

The toggle support 15 is connected to the fixed platen 12 at a distance, and is mounted on the frame Fr so as to be movable in the mold opening/closing direction. The toggle support 15 may be movable along a guide laid on the frame Fr. The guide of the toggle support 15 may be the same as the guide 17 of the movable platen 13.

In the present embodiment, the fixed platen 12 is fixed to the frame Fr, and the toggle support 15 is movable in the mold opening/closing direction with respect to the frame Fr. However, the toggle support 15 is fixed to the frame Fr and the fixed platen is fixed. 12 may be movable in the mold opening/closing direction with respect to the frame Fr.

The tie bar 16 connects the fixed platen 12 and the toggle support 15 with a space therebetween. A plurality of tie bars 16 (for example, four) may be used. Each tie bar 16 is parallel to the mold opening/closing direction and extends according to the mold clamping force. At least one tie bar 16 is provided with a mold clamping force detector 18. The mold clamping force detector 18 detects the mold clamping force by detecting the distortion of the tie bar 16, and sends a signal indicating the detection result to the control device 90.

The mold clamping force detector 18 is not limited to the strain gauge type, and may be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, or the like, and its mounting position is not limited to the tie bar 16.

The toggle mechanism 20 moves the movable platen 13 with respect to the fixed platen 12. The toggle mechanism 20 is arranged between the movable platen 13 and the toggle support 15. The toggle mechanism 20 includes a crosshead 21, a pair of link groups, and the like. Each link group has a first link 22 and a second link 23 that are flexibly connected by a pin or the like. The first link 22 is swingably attached to the movable platen 13 with a pin or the like, and the second link 23 is swingably attached to the toggle support 15 with a pin or the like. The second link 23 is coupled to the crosshead 21 via the third link 24. When the crosshead 21 is moved back and forth, the first link 22 and the second link 23 are bent and stretched, and the movable platen 13 is moved back and forth with respect to the toggle support 15.

The configuration of the toggle mechanism 20 is not limited to the configurations shown in FIGS. 1 and 2. For example, although the number of nodes is five in FIGS. 1 and 2, it may be four, and one end of the third link 24 may be coupled to the nodes of the first link 22 and the second link 23. ..

The mold clamping motor 25 is attached to the toggle support 15 and operates the toggle mechanism 20. The mold clamping motor 25 moves the crosshead 21 forward and backward, thereby bending and stretching the first link 22 and the second link 23, and moving the movable platen 13 forward and backward.

The motion conversion mechanism 26 converts the rotational motion of the mold clamping motor 25 into the linear motion of the crosshead 21. The motion converting mechanism 26 includes a screw shaft 26a and a screw nut 26b screwed onto the screw shaft 26a. A ball or a roller may be interposed between the screw shaft 26a and the screw nut 26b.

The control device 90 has a CPU (Central Processing Unit) 91, a storage medium 92 such as a memory, an input interface 93, and an output interface 94, as shown in FIGS. The control device 90 executes various programs by causing the CPU 91 to execute the programs stored in the storage medium 92. Further, in the control device 90, the input interface 93 receives a signal from the outside, and the output interface 94 transmits the signal to the outside. The controller 90 controls a mold closing process, a mold clamping process, a mold opening process, and the like.

In the mold closing process, the mold clamping motor 25 is driven to move the crosshead 21 forward to the mold closing completed position at a set speed, thereby moving the movable platen 13 forward and touching the movable mold 33 to the fixed mold 32. The position and speed of the crosshead 21 are detected using, for example, the encoder 25a of the mold clamping motor 25. The encoder 25a detects the rotation of the mold clamping motor 25 and sends a signal indicating the detection result to the control device 90.

In the mold clamping process, the mold clamping motor 25 is further driven to further advance the crosshead 21 from the mold closing completed position to the mold clamping position, thereby generating a mold clamping force. A cavity space 34 is formed between the movable die 33 and the fixed die 32 during mold clamping, and the injection device 40 fills the cavity space 34 with a liquid molding material. A molded product is obtained by solidifying the filled molding material. There may be a plurality of cavity spaces 34, in which case a plurality of molded products can be obtained at the same time.

In the mold opening process, the mold clamping motor 25 is driven to retract the crosshead 21 to the mold opening completion position at a set speed, thereby retracting the movable platen 13 and separating the movable mold 33 from the fixed mold 32. Then, the ejector device 50 projects the molded product from the movable mold 33.

By the way, the toggle mechanism 20 amplifies the driving force of the mold clamping motor 25 and transmits it to the movable platen 13. The amplification factor is also called the toggle factor. The toggle magnification changes according to the angle θ formed by the first link 22 and the second link 23 (hereinafter, also referred to as “link angle θ”). The link angle θ is obtained from the position of the crosshead 21. When the link angle θ is 180°, the toggle magnification becomes maximum.

When the thickness of the mold device 30 changes due to the replacement of the mold device 30 or the temperature change of the mold device 30, the mold thickness is adjusted so that a predetermined mold clamping force can be obtained during mold clamping. In the mold thickness adjustment, for example, the distance L between the fixed platen 12 and the toggle support 15 is adjusted so that the link angle θ of the toggle mechanism 20 becomes a predetermined angle at the time of a mold touch in which the movable mold 33 touches the fixed mold 32. Adjust.

The mold clamping device 10 has a mold thickness adjusting mechanism 60 that adjusts the mold thickness by adjusting the distance L between the fixed platen 12 and the toggle support 15. The mold thickness adjusting mechanism 60 rotates a screw shaft 61 formed at the rear end of the tie bar 16, a screw nut 62 rotatably held by the toggle support 15, and a screw nut 62 screwed to the screw shaft 61. And a mold thickness adjusting motor 63.

The screw shaft 61 and the screw nut 62 are provided for each tie bar 16. The rotation of the mold thickness adjusting motor 63 may be transmitted to the plurality of screw nuts 62 via the rotation transmitting portion 64 including a belt, a pulley, and the like. The plurality of screw nuts 62 can be rotated in synchronization. It is also possible to individually rotate the plurality of screw nuts 62 by changing the transmission path of the rotation transmission unit 64.

The rotation transmission unit 64 may be configured by gears or the like instead of the belt or the pulley. In this case, a passive gear is formed on the outer periphery of each screw nut 62, a drive gear is attached to the output shaft of the mold thickness adjusting motor 63, and a plurality of passive gears and an intermediate gear meshing with the drive gear are provided at the center of the toggle support 15. It is rotatably held in.

The operation of the mold thickness adjusting mechanism 60 is controlled by the controller 90. The controller 90 drives the mold thickness adjusting motor 63 to rotate the screw nut 62, thereby adjusting the position of the toggle support 15 that holds the screw nut 62 rotatably with respect to the fixed platen 12, and the fixed platen 12 and The distance L from the toggle support 15 is adjusted.

In the present embodiment, the screw nut 62 is rotatably held by the toggle support 15 and the tie bar 16 on which the screw shaft 61 is formed is fixed to the fixed platen 12, but the present invention is not limited to this.

For example, the screw nut 62 may be rotatably held with respect to the fixed platen 12, and the tie bar 16 may be fixed with respect to the toggle support 15. In this case, the interval L can be adjusted by rotating the screw nut 62.

Further, the screw nut 62 may be fixed to the toggle support 15, and the tie bar 16 may be rotatably held on the fixed platen 12. In this case, the interval L can be adjusted by rotating the tie bar 16.

Furthermore, the screw nut 62 may be fixed to the fixed platen 12, and the tie bar 16 may be rotatably held to the toggle support 15. In this case, the interval L can be adjusted by rotating the tie bar 16.

The mold thickness adjusting mechanism 60 adjusts the interval L by rotating one of the screw shaft 61 and the screw nut 62 that are screwed together. A plurality of mold thickness adjusting mechanisms 60 may be used, and a plurality of mold thickness adjusting motors 63 may be used.

By the way, the components of the mold clamping device 10 deteriorate due to repeated molding operations. Among the components of the mold clamping device 10, components that receive a force, particularly sliding components, are relatively susceptible to deterioration. Examples of such sliding parts include a pin of the toggle mechanism 20, a motion conversion mechanism 26, and a bearing. The bearing may be a sliding bearing such as a bush or a rolling bearing.

Due to the deterioration of the components of the mold clamping device 10, for example, the balance of the pair of link groups of the toggle mechanism 20 is lost, the screw shaft 26a of the motion conversion mechanism 26 is bent, and the balance of the plurality of tie bars 16 is lost. Further, due to deterioration of the components of the mold clamping device 10, backlash occurs, friction resistance increases, and operation becomes unstable.

The control device 90 monitors the driving force of the mold clamping motor 25 when stopping the crosshead 21 at a predetermined position in order to detect deterioration of the components of the mold clamping device 10. The stop of the crosshead 21 may be accompanied by the movement of the crosshead 21, or may be temporarily performed during the movement. The stop of the crosshead 21 may be repeatedly performed in each molding cycle for manufacturing a molded product, and may be performed between molding cycles or during a molding cycle. A series of operations for obtaining a molded product, for example, an operation from the start of a mold closing process to the start of the next mold closing process is also referred to as “shot” and “molding cycle”. The stop of the crosshead 21 may be performed during the control of the crosshead 21, for example, during the position control of the crosshead 21. The crosshead 21 corresponds to the movable part described in the claims, and the mold clamping motor 25 corresponds to the drive part described in the claims.

The driving force of the mold clamping motor 25 is represented by the torque of the mold clamping motor 25, for example, and is detected by the torque detector 27. The torque detector 27 detects the current of the mold clamping motor 25 to detect the torque of the mold clamping motor 25, and sends a signal indicating the detection result to the control device 90. The torque detector 27 corresponds to the driving force detection unit described in the claims. The torque of the mold clamping motor 25 can be obtained from the current command value of the mold clamping motor 25.

The detection value of the torque detector 27 monitored by the control device 90 may be any of a peak value, an average value, a pattern, and the like while the crosshead 21 is stopped. The control device 90 detects the deterioration of the parts of the mold clamping device 10 by comparing the peak value and the average value with the reference value, comparing the pattern with the reference pattern, and the like. The reference value, the reference pattern, and the like are obtained in advance by a test or the like, and those stored in the storage medium 92 are read and used.

For example, the control device 90 detects deterioration of the components of the mold clamping device 10 based on the torque of the mold clamping motor 25 when stopping the crosshead 21 at the mold opening completion position. When the components of the mold clamping device 10 deteriorate, the crosshead 21 stops before the mold opening completion position due to frictional resistance or the like, and the torque of the mold clamping motor 25 increases because the crosshead 21 is moved to the mold opening completion position. Further, when the components of the mold clamping device 10 deteriorate, the torque of the mold clamping motor 25 for maintaining the crosshead 21 at the mold opening completion position increases. When the components of the mold clamping device 10 are not deteriorated, the torque of the mold clamping motor 25 for maintaining the crosshead 21 at the mold opening completion position is substantially zero. When the torque of the mold clamping motor 25 is equal to or higher than the threshold value, the control device 90 may determine that the components of the mold clamping device 10 are deteriorated.

Further, the control device 90 detects deterioration of parts of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when stopping the crosshead 21 at the mold clamping position. When the components of the mold clamping device 10 deteriorate, the driving force of the mold clamping motor for maintaining the crosshead 21 at the mold clamping position changes. When the parts of the mold clamping device 10 are not deteriorated, the torque of the mold clamping motor 25 for maintaining the crosshead 21 in the mold clamping position is substantially constant. When the fluctuation range of the torque of the mold clamping motor 25 is equal to or larger than the threshold value, the control device 90 may determine that the components of the mold clamping device 10 are deteriorated.

The control device 90 monitors the strain of the tie bar 16 when the crosshead 21 is stopped at a predetermined position in order to detect the deterioration of the parts of the mold clamping device 10. The tie bar 16 corresponds to the driving force acting portion described in the claims.

The strain of the tie bar 16 can be detected by, for example, the mold clamping force detector 18. The mold clamping force detector 18 detects the strain of the tie bar 16 and sends a signal indicating the detection result to the control device 90. The mold clamping force detector 18 corresponds to the strain detecting section described in the claims.

The detection value of the mold clamping force detector 18 monitored by the control device 90 may be any of a peak value, an average value, a pattern, and the like while the crosshead 21 is stopped. The control device 90 detects the deterioration of the parts of the mold clamping device 10 by comparing the peak value and the average value with the reference value, comparing the pattern with the reference pattern, and the like. The reference value, the reference pattern, and the like are obtained in advance by a test or the like, and those stored in the storage medium 92 are read and used.

For example, the control device 90 detects the deterioration of the components of the mold clamping device 10 based on the strain of the tie bar 16 when the crosshead 21 is stopped at the mold opening completion position. When the components of the mold clamping device 10 deteriorate and the balance of the tie bar 16 is lost, for example, the strain remains in the tie bar 16 when the mold opening is completed. When the components of the mold clamping device 10 are not deteriorated, the strain of the tie bar 16 at the completion of mold opening is substantially zero. When the strain of the tie bar 16 is equal to or larger than the threshold value, the control device 90 may determine that the components of the mold clamping device 10 are deteriorated.

Further, the control device 90 may monitor the strain of the tie bar 16 when the crosshead 21 is stopped at the mold clamping position in order to detect the deterioration of the components of the mold clamping device 10. When the parts of the mold clamping device 10 deteriorate and the balance of the tie bar 16 is lost, for example, the strain of the tie bar 16 during mold clamping changes. When the parts of the mold clamping device 10 are not deteriorated, the strain of the tie bar 16 during the mold clamping is substantially constant. When the variation range of the strain of the tie bar 16 is outside the allowable range, the control device 90 may determine that the components of the mold clamping device 10 are deteriorated.

The driving force acting portion is not limited to the tie bar 16 as long as it is distorted by the driving force of the mold clamping motor 25. Examples of the driving force acting unit include the toggle mechanism 20, the motion conversion mechanism 26, the movable platen 13, the fixed platen 12, and the like.

As described above, the control device 90 of the present embodiment deteriorates the components of the mold clamping device 10 based on the driving force of the mold clamping motor 25 and the distortion of the tie bar 16 when stopping the crosshead 21 at a predetermined position. To detect. Since the crosshead 21 is stopped at a predetermined position regardless of the molding conditions such as the mold apparatus 30 and the molding material, it is possible to cope with various molding conditions.

The controller 90 may estimate the degree of deterioration of the components of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when the crosshead 21 is stopped at a predetermined position and the distortion of the tie bar 16. The relationship between the driving force of the mold clamping motor 25 or the distortion of the tie bar 16 and the degree of deterioration of the components of the mold clamping device 10 is obtained by a durability test or the like, and one stored in advance in the storage medium 92 is read and used.

The control device 90 causes the output device 96 to output a notification regarding the estimated deterioration degree. An image display device, a speaker, a warning light, and the like are used as the output device 96, and an image, sound, light, or the like is used for notification. The user of the injection molding machine that has received the notification can know the degree of deterioration of the parts of the mold clamping device 10.

For example, the control device 90 may cause the output device 96 to output a notification indicating the relationship between the estimated deterioration degree and the allowable range thereof. The user of the injection molding machine that has received the notification can know the remaining life of the components of the mold clamping device 10. It is possible to replace the parts of the mold clamping device 10 before the parts of the mold clamping device 10 are damaged.

Moreover, the control device 90 may output an alarm to the output device 96 when the estimated deterioration degree exceeds the allowable range. A plurality of thresholds of the allowable range may be prepared, and a plurality of types of alarms may be prepared. In this case, the control device 90 causes the output device 96 to output an alarm according to the estimated deterioration degree.

The notification of the minor abnormality before the occurrence of the serious abnormality enables countermeasures such as preparation and replacement of replacement parts in advance before the parts of the mold clamping device 10 are broken. By performing the replacement before the parts of the mold clamping device 10 are broken, it is possible to avoid the damage of the peripheral parts and the interruption of the production of the molded product. In addition, after the notification of the lightweight abnormality, the replacement part may be prepared before the serious abnormality occurs, so that the storage period of the replacement part can be shortened and the space of the storage location can be reduced.

The control device 90 may stop the operation of the injection molding machine when the estimated deterioration degree exceeds the allowable range. For example, the control device 90 may stop the operation of the injection molding machine when detecting a serious abnormality. The operation of stopping may be, for example, a cycle operation in which a molded product is repeatedly manufactured. When the serious abnormality has not occurred and only the sign of the serious abnormality has occurred, the control device 90 may continue the cycle operation. Then, if a serious abnormality occurs, the cycle operation is interrupted and the defective part is repaired or replaced.

The control device 90 may send a notification regarding the deterioration of the parts of the mold clamping device 10 to the management server 98 via the network 97 such as the Internet line. At this time, the control device 90 associates the notification regarding the deterioration of the parts of the mold clamping device 10 with the identification number of the injection molding machine, and transmits the notification to the management server 98. The management server 98 has a CPU, a storage medium, and the like, like the control device 90.

The management server 98 receives the information transmitted from the control device 90. The management server 98 transmits the received information to the receiving terminal 99 registered in advance via the network 97. The receiving terminal 99 may be a fixed terminal such as a computer or a mobile terminal such as a mobile phone. The user of the injection molding machine can save the trouble of contacting the administrator of the injection molding machine. Based on the information received by the receiving terminal 99, the administrator prepares replacement parts and arranges repair work personnel.

The control device 90 may transmit the information to the pre-registered receiving terminal 99 without going through the management server 98.

FIG. 3 is a diagram showing a temporal change in the position of the crosshead according to the embodiment. The position of the crosshead 21 shown in FIG. 3 is controlled by the controller 90.

In the mold closing process, the mold clamping motor 25 is driven to move the crosshead 21 forward to the mold closing completed position at a set speed, thereby moving the movable platen 13 forward and touching the movable mold 33 to the fixed mold 32. The position and speed of the crosshead 21 are detected using, for example, the encoder 25a of the mold clamping motor 25. The encoder 25a of the mold clamping motor 25 detects the rotation of the mold clamping motor 25 and sends a signal indicating the detection result to the control device 90.

In the mold clamping process, the mold clamping motor 25 is further driven to further advance the crosshead 21 from the mold closing completed position to the mold clamping position, thereby generating a mold clamping force. A cavity space 34 is formed between the movable die 33 and the fixed die 32 during mold clamping, and the injection device 40 fills the cavity space 34 with a liquid molding material. A molded product is obtained by solidifying the filled molding material. There may be a plurality of cavity spaces 34, in which case a plurality of molded products can be obtained at the same time.

In the mold opening process, the mold clamping motor 25 is driven to retract the crosshead 21 to the mold opening completion position at a set speed, thereby retracting the movable platen 13 and separating the movable mold 33 from the fixed mold 32. Then, the ejector device 50 ejects the molded product from the movable mold 33.

The setting conditions in the mold closing process and the mold clamping process are collectively set as a series of setting conditions. For example, the speed and position (including the speed switching position, the mold closing completion position, and the mold clamping position) of the crosshead 21 in the mold closing process and the mold clamping process are collectively set as a series of setting conditions. Instead of the speed or position of the crosshead 21, the speed or position of the movable platen 13 may be set. Further, the mold clamping force may be set instead of the position of the crosshead (for example, the mold clamping position) or the position of the movable platen.

As shown in FIG. 3, the control device 90 advances the crosshead 21 from the mold opening completion position to the mold clamping position, stops it at the mold clamping position for a predetermined time, and retracts it from the mold clamping position to the mold opening completion position. It is repeated to stop at the mold opening completion position for a predetermined time. The crosshead 21 is stopped at the mold opening completion position and the mold clamping position.

Therefore, the control device 90 detects deterioration of the components of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when the crosshead 21 is stopped at at least one of the mold opening completion position and the mold clamping position. The presence or absence of abnormality due to the deterioration may be determined.

For example, the control device 90 detects deterioration of parts of the mold clamping device 10 based on the torque of the mold clamping motor 25 when the crosshead 21 is stopped at the mold opening completion position. When the parts of the mold clamping device 10 deteriorate, the crosshead 21 stops before the mold opening completion position due to frictional resistance and the like, and the torque of the mold clamping motor 25 increases because the crosshead 21 is moved to the mold opening completion position. Further, when the components of the mold clamping device 10 deteriorate, the torque of the mold clamping motor 25 for maintaining the crosshead 21 at the mold opening completion position increases. When the components of the mold clamping device 10 are not deteriorated, the torque of the mold clamping motor 25 for maintaining the crosshead 21 at the mold opening completion position is substantially zero. When the torque of the mold clamping motor 25 is equal to or higher than the threshold value, the control device 90 may determine that the components of the mold clamping device 10 are deteriorated and that an abnormality has occurred.

Further, the control device 90 detects deterioration of parts of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when stopping the crosshead 21 at the mold clamping position. When the components of the mold clamping device 10 deteriorate, the driving force of the mold clamping motor for maintaining the crosshead 21 at the mold clamping position changes. When the parts of the mold clamping device 10 are not deteriorated, the torque of the mold clamping motor 25 for maintaining the crosshead 21 in the mold clamping position is substantially constant. When the fluctuation range of the torque of the mold clamping motor 25 is equal to or greater than the threshold value, the control device 90 may determine that the components of the mold clamping device 10 have deteriorated and that an abnormality has occurred.

The controller 90 may detect the deterioration of the parts of the mold clamping device 10 based on the strain of the tie bar 16 when the crosshead 21 is stopped at at least one of the mold opening completion position and the mold clamping position. The presence or absence of abnormality due to deterioration may be determined.

For example, the control device 90 detects the deterioration of the components of the mold clamping device 10 based on the strain of the tie bar 16 when the crosshead 21 is stopped at the mold opening completion position. When the components of the mold clamping device 10 deteriorate and the balance of the tie bar 16 is lost, for example, the strain remains in the tie bar 16 when the mold opening is completed. When the components of the mold clamping device 10 are not deteriorated, the strain of the tie bar 16 at the completion of mold opening is substantially zero. When the strain of the tie bar 16 is equal to or more than the threshold value, the control device 90 may determine that the components of the mold clamping device 10 are deteriorated and the abnormality has occurred.

Further, the control device 90 may monitor the strain of the tie bar 16 when the crosshead 21 is stopped at the mold clamping position in order to detect the deterioration of the components of the mold clamping device 10. When the parts of the mold clamping device 10 deteriorate and the balance of the tie bar 16 is lost, for example, the strain of the tie bar 16 during mold clamping changes. When the parts of the mold clamping device 10 are not deteriorated, the strain of the tie bar 16 during the mold clamping is substantially constant. When the variation range of the strain of the tie bar 16 is outside the allowable range, the control device 90 may determine that the components of the mold clamping device 10 have deteriorated and an abnormality has occurred.

The controller 90 may determine the presence or absence of abnormality due to deterioration at a plurality of different stop positions. By determining the presence/absence of abnormality due to deterioration at a plurality of different stop positions, the presence/absence of multiple types of abnormality can be determined, and the degree of deterioration can be determined in two or more stages. For example, the control device 90 may change the degree of deterioration depending on whether it is determined that the abnormality occurs only at one stop position or when it is determined that the abnormality occurs at a plurality of different stop positions. Since the degree of deterioration can be determined in two or more stages, the degree of deterioration can be managed accurately. Further, as described above, different types of alarms can be output depending on the degree of deterioration.

The control device 90 may determine whether or not there is an abnormality due to the deterioration of the motion conversion mechanism 26 among the components of the mold clamping device 10, and may estimate the deteriorated portion of the motion conversion mechanism 26. The deteriorated portion of the motion conversion mechanism 26 can be estimated from the stop position of the crosshead 21 when it is determined that there is an abnormality due to the deterioration of the motion conversion mechanism 26.

For example, when the stop position of the crosshead 21 when it is determined that there is an abnormality due to the deterioration of the motion conversion mechanism 26 is the mold opening completion position, the screw shaft 26a has a screw at the completion of mold opening (see FIG. 1). It is estimated that the screwed portion with the nut 26b is at the deteriorated position.

Further, when the stop position of the crosshead 21 when it is determined that there is an abnormality due to deterioration of the motion conversion mechanism 26 is the mold clamping position, the screw nut 26b of the screw shaft 26a during mold clamping (see FIG. 2). It is estimated that the screwed portion with and is the deterioration position.

Further, when there are a plurality of stop positions of the crosshead 21 when it is determined that there is an abnormality due to deterioration of the motion conversion mechanism 26 (for example, both the mold opening completion position and the mold clamping position), the control device 90 causes the screw nut 26b. May be determined to have deteriorated.

The controller 90 may set a dedicated time (for example, the deterioration detection time shown in FIG. 3) for detecting the deterioration of the parts of the mold clamping device 10 during the molding cycle and/or between the molding cycles. In FIG. 3, the time for stopping the crosshead 21 at the mold opening completion position in one shot is set longer than the time for stopping the crosshead at the mold opening completion position in another shot, so that the deterioration detection is performed. Set time during molding cycle. Although the deterioration detection time is set at the end of the stop time in FIG. 3, it may be set at the beginning of the stop time or in the middle of the stop time. By setting the deterioration detection time, it is possible to surely detect the deterioration.

Note that the control device 90 sets the time for stopping the crosshead 21 at the mold clamping position in one shot to be longer than the time for stopping the crosshead 21 in the mold clamping position in another shot, thereby deteriorating. The detection time may be set during the molding cycle. The deterioration detection time may be set every time the number of shots reaches a predetermined number of times, but may be set for each shot or may be set for each predetermined shot.

FIG. 4 is a diagram showing a compression molding operation of the mold clamping device according to the embodiment. 4A shows the state when the crosshead is at the mold opening completion position, FIG. 4B shows the state when the crosshead is at the compression standby position, and FIG. 4C shows the state when the crosshead is compression molded. The respective states when in the position are shown. FIG. 5: is a figure which shows the time change of the position of a cross head in the compression molding of the mold clamping apparatus by one Embodiment.

The mold device 30A shown in FIG. 4 includes a fixed mold 32A attached to the fixed platen 12 and a movable mold 33A attached to the movable platen 13. The movable mold 33A has a mold body portion 35A, a frame-shaped portion 36A, and a spring portion 37A. The frame-shaped portion 36A surrounds the convex portion of the mold main body portion 35A and is connected to the mold main body portion 35A via the spring portion 37A.

The control device 90 advances the movable platen 13 by advancing the crosshead 21 from the mold opening completion position shown in FIG. 4A to the compression standby position. As a result, the frame-shaped portion 36A of the movable die 33A is pressed against the fixed die 32A, the spring portion 37A of the movable die 33A contracts, and the gap between the die main body portion 35A of the movable die 33A and the fixed die 32A is reduced. A cavity space 34A is formed in the.

Subsequently, the control device 90 holds the crosshead 21 at the compression standby position for a predetermined time. Meanwhile, the control device 90 starts the filling process of filling the cavity space 34A with the molding material.

Next, the control device 90 further advances the movable platen 13 by further advancing the crosshead 21 from the compression standby position to the compression molding position. As a result, the spring portion 37A of the movable mold 33A further contracts, the cavity space 34A becomes smaller, and the molding material filled in the cavity space 34A is compressed.

Subsequently, the control device 90 holds the crosshead 21 at the compression molding position for a predetermined time. While the cross head 21 is held at the compression molding position for a predetermined time, the molding material filled in the cavity space 34A is solidified to obtain a molded product.

Then, the controller 90 retracts the crosshead 21 from the compression molding position to the mold opening completion position. In this embodiment, after the crosshead 21 is held at the compression molding position for a predetermined time, the crosshead 21 is retracted to the mold opening completion position, but the crosshead 21 is advanced or retracted during that time. Alternatively, it may be stopped on the way. There is no limit to the number of set positions of the crosshead 21.

As shown in FIG. 5, the control device 90 advances the crosshead 21 from the mold opening completion position to the compression standby position, stops it at the compression standby position for a predetermined time, advances it from the compression standby position to the compression molding position, and compresses it. The process is repeatedly stopped at the molding position for a predetermined time, retracted from the compression molding position to the mold opening completion position, and stopped at the mold opening completion position for a predetermined time. The crosshead 21 is stopped at the mold opening completion position, the compression standby position, and the compression molding position.

Therefore, the control device 90 controls the parts of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when the crosshead 21 is stopped at at least one of the mold opening completion position, the compression standby position, and the compression molding position. May be detected, and the presence or absence of an abnormality due to the deterioration may be determined.

For example, the control device 90 detects deterioration of parts of the mold clamping device 10 based on the torque of the mold clamping motor 25 when the crosshead 21 is stopped at the mold opening completion position. When the components of the mold clamping device 10 deteriorate, the crosshead 21 stops before the mold opening completion position due to frictional resistance or the like, and the torque of the mold clamping motor 25 increases because the crosshead 21 is moved to the mold opening completion position. Further, when the components of the mold clamping device 10 deteriorate, the torque of the mold clamping motor 25 for maintaining the crosshead 21 at the mold opening completion position increases. When the components of the mold clamping device 10 are not deteriorated, the torque of the mold clamping motor 25 for maintaining the crosshead 21 at the mold opening completion position is substantially zero. When the torque of the mold clamping motor 25 is equal to or greater than the threshold value, the control device 90 may determine that the components of the mold clamping device 10 are deteriorated and that an abnormality has occurred.

Further, the control device 90 detects deterioration of parts of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when the crosshead 21 is stopped at the compression standby position. When the parts of the mold clamping device 10 deteriorate, the driving force of the mold clamping motor for maintaining the crosshead 21 in the compression standby position fluctuates against the elastic restoring force of the spring portion 37A. When the components of the mold clamping device 10 are not deteriorated, the torque of the mold clamping motor 25 for maintaining the crosshead 21 in the compression standby position is substantially constant. When the fluctuation range of the torque of the mold clamping motor 25 is equal to or larger than the threshold value, the control device 90 may determine that the components of the mold clamping device 10 have deteriorated and an abnormality has occurred.

Further, the control device 90 detects deterioration of parts of the mold clamping device 10 based on the driving force of the mold clamping motor 25 when stopping the crosshead 21 at the compression molding position. When the components of the mold clamping device 10 deteriorate, the driving force of the mold clamping motor for maintaining the crosshead 21 at the compression molding position fluctuates against the elastic restoring force of the spring portion 37A and the pressure of the molding material. When the parts of the mold clamping device 10 are not deteriorated, the torque of the mold clamping motor 25 for maintaining the crosshead 21 in the compression molding position is substantially constant. When the fluctuation range of the torque of the mold clamping motor 25 is equal to or greater than the threshold value, the control device 90 may determine that the components of the mold clamping device 10 have deteriorated and that an abnormality has occurred.

The controller 90 detects the deterioration of the parts of the mold clamping device 10 based on the strain of the tie bar 16 when the crosshead 21 is stopped at at least one of the mold opening completion position, the compression standby position, and the compression molding position. The presence or absence of abnormality due to the deterioration may be determined.

For example, the control device 90 detects the deterioration of the components of the mold clamping device 10 based on the strain of the tie bar 16 when the crosshead 21 is stopped at the mold opening completion position. When the components of the mold clamping device 10 deteriorate and the balance of the tie bar 16 is lost, for example, the strain remains in the tie bar 16 when the mold opening is completed. When the components of the mold clamping device 10 are not deteriorated, the strain of the tie bar 16 at the completion of mold opening is substantially zero. When the strain of the tie bar 16 is equal to or more than the threshold value, the control device 90 may determine that the components of the mold clamping device 10 are deteriorated and the abnormality has occurred.

Further, the control device 90 may monitor the strain of the tie bar 16 when the crosshead 21 is stopped at the compression standby position in order to detect the deterioration of the components of the mold clamping device 10. When the components of the mold clamping device 10 deteriorate and the balance of the tie bar 16 is lost, for example, the strain of the tie bar 16 during the compression standby changes. When the components of the mold clamping device 10 are not deteriorated, the strain of the tie bar 16 during the compression standby is substantially constant. When the variation range of the strain of the tie bar 16 is outside the allowable range, the control device 90 may determine that the components of the mold clamping device 10 have deteriorated and an abnormality has occurred.

Further, the control device 90 may monitor the strain of the tie bar 16 when the crosshead 21 is stopped at the compression molding position in order to detect the deterioration of the components of the mold clamping device 10. When the components of the mold clamping device 10 deteriorate and the balance of the tie bar 16 is lost, for example, the strain of the tie bar 16 at the time of compression changes. When the parts of the mold clamping device 10 are not deteriorated, the strain of the tie bar 16 during compression is substantially constant. When the variation range of the strain of the tie bar 16 is outside the allowable range, the control device 90 may determine that the components of the mold clamping device 10 have deteriorated and an abnormality has occurred.

The controller 90 may determine the presence or absence of abnormality due to deterioration at a plurality of different stop positions. By determining the presence/absence of abnormality due to deterioration at a plurality of different stop positions, the presence/absence of multiple types of abnormality can be determined, and the degree of deterioration can be determined in two or more stages. For example, the control device 90 may change the degree of deterioration depending on whether it is determined that the abnormality occurs only at one stop position or when it is determined that the abnormality occurs at a plurality of different stop positions. Since the degree of deterioration can be determined in two or more stages, the degree of deterioration can be managed accurately. Further, as described above, different types of alarms can be output depending on the degree of deterioration.

The control device 90 may determine whether or not there is an abnormality due to the deterioration of the motion conversion mechanism 26 among the components of the mold clamping device 10, and may estimate the deteriorated portion of the motion conversion mechanism 26. The deteriorated portion of the motion conversion mechanism 26 can be estimated from the stop position of the crosshead 21 when it is determined that there is an abnormality due to the deterioration of the motion conversion mechanism 26.

For example, when the stop position of the crosshead 21 when it is determined that there is an abnormality due to the deterioration of the motion conversion mechanism 26 is the mold opening completion position, among the screw shafts 26a, when the mold opening is completed (see FIG. 4A). It is presumed that the screwed portion with the screw nut 26b in 4) is the deteriorated position.

Further, when the stop position of the crosshead 21 when it is determined that there is an abnormality due to the deterioration of the motion conversion mechanism 26 is the compression standby position, the screw shaft 26a is in the compression standby state (see FIG. 4B). It is estimated that the screwed portion with the screw nut 26b is at the deteriorated position.

Further, when the stop position of the crosshead 21 when it is determined that there is an abnormality due to the deterioration of the motion conversion mechanism 26 is the compression molding position, the screw shaft 26a at the time of compression molding (see FIG. 4C). It is estimated that the screwed portion with the screw nut 26b is at the deteriorated position.

Further, when there are a plurality of stop positions of the crosshead 21 when it is determined that there is an abnormality due to the deterioration of the motion conversion mechanism 26 (for example, the mold opening completion position, the compression standby position, and the compression molding position), the control device 90 causes the screw to move. It may be determined that the nut 26b is deteriorated.

The control device 90 may set a dedicated time (for example, the deterioration detection time shown in FIG. 5) for detecting the deterioration of the parts of the mold clamping device 10 during the molding cycle and/or between the molding cycles. In FIG. 5, by setting the time for stopping the crosshead 21 at the mold opening completion position in one shot to be longer than the time for stopping the crosshead in the mold opening completion position in another shot, the deterioration detection is performed. Set time during molding cycle. Although the deterioration detection time is set at the end of the stop time in FIG. 5, it may be set at the beginning of the stop time or in the middle of the stop time. By setting the deterioration detection time, it is possible to surely detect the deterioration.

Note that the control device 90 sets the time for stopping the crosshead 21 at the compression standby position in one shot to be longer than the time for stopping the crosshead 21 in the compression standby position in another shot, thereby deteriorating. The detection time may be set during the molding cycle. Similarly, by setting the time for stopping the crosshead 21 at the compression molding position in one shot to be longer than the time for stopping the crosshead 21 in the compression molding position in another shot, the deterioration detection time can be increased. It may be set during the molding cycle. The deterioration detection time may be set every time the number of shots reaches a predetermined number of times, but may be set for each shot or may be set for each predetermined shot.

In the present embodiment, the movable mold 33A has the mold body portion 35A, the frame-shaped portion 36A, and the spring portion 37A, but the fixed mold 32A has the mold body portion, the frame-shaped portion, and the spring portion. You may. A hydraulic cylinder may be used instead of the spring portion 37A as a member arranged between the mold body portion 35A and the frame-shaped portion 36A. Further, the mold device 30A may be a spigot type or the like.

Although the embodiments of the injection molding machine and the like have been described above, the present invention is not limited to the above embodiments and the like, and various modifications within the scope of the gist of the present invention described in the claims. It can be improved.

In the above embodiment, the control device 90 corresponds to the injection molding information management device described in the claims, but the injection molding information management device may be provided separately from the control device 90. Further, in the above embodiment, the crosshead 21 corresponds to the movable part described in the claims and the mold clamping motor 25 corresponds to the drive part described in the claims, but the present invention is not limited to this.

For example, the control device 90 of the above-described embodiment is used to detect deterioration of parts of the mold clamping device 10, but detects deterioration of parts of the injection device 40 and causes the injection device 40 to contact and separate from the mold device 30. It may be used for detecting deterioration of parts of the moving device, detecting deterioration of parts of the ejector device 50, and the like. Of the parts such as the injection device 40, the moving device, and the ejector device 50, the parts may be used for detecting deterioration of parts that receive a force, particularly sliding parts. As the sliding component, as described above, a motion conversion mechanism such as a ball screw mechanism can be used.

The mold clamping device 10 of the above embodiment is a horizontal mold in which the mold opening/closing direction is horizontal, but may be a vertical mold in which the mold opening/closing direction is vertical.

The vertical mold clamping device includes a lower platen, an upper platen, a toggle support, a tie bar, a toggle mechanism, a mold clamping motor, and a mold thickness adjusting mechanism. One of the lower platen and the upper platen is used as a fixed platen, and the other one is used as a movable platen. A lower die is attached to the lower platen, and an upper die is attached to the upper platen. The lower mold and the upper mold constitute a mold device. The lower mold may be attached to the lower platen via a rotary table. The toggle support is arranged below the lower platen. The toggle mechanism is arranged between the toggle support and the lower platen. The tie bar is parallel to the vertical direction, penetrates the lower platen, and connects the upper platen and the toggle support.

The vertical mold thickness adjusting mechanism adjusts the mold thickness by adjusting the distance between the upper platen and the toggle support according to the change in the thickness of the mold device. In this mold thickness adjustment, the interval between the upper platen and the toggle support is adjusted so that the link angle of the toggle mechanism becomes a predetermined angle at the time of the die touch where the lower die and the upper die touch. The link angle can be adjusted to a predetermined angle when the mold is closed, and a predetermined mold clamping force can be obtained when the mold is clamped. The mold thickness adjusting mechanism includes a screw shaft formed on the tie bar, a screw nut held by one of the upper platen and the toggle support, and a mold thickness adjusting motor that rotates one of the screw shaft and the screw nut that are screwed together. Have. The mold thickness adjusting mechanism may further include a screw nut held on the other of the upper platen and the toggle support.

Although the mold clamping device 10 of the above-described embodiment has the toggle mechanism 20 and the mold clamping motor 25 that operates the toggle mechanism 20, it may have a linear motor for mold opening/closing and an electromagnet for mold clamping.

The electromagnet type mold clamping device has, for example, a fixed platen, a movable platen, a rear platen, a tie bar, a suction plate, a rod, and a mold thickness adjusting mechanism. The rear platen is arranged on the side opposite to the fixed platen (that is, behind the movable platen) with the movable platen as a reference. The tie bar connects the fixed platen and the rear platen at intervals in the mold opening/closing direction. The suction plate is movable back and forth together with the movable platen behind the rear platen. The rod is inserted into the through hole of the rear platen and connects the movable platen and the suction plate. An electromagnet is formed on at least one of the rear platen and the suction plate, and the suction force of the electromagnet acts between the rear platen and the suction plate to generate a mold clamping force.

The electromagnet type mold thickness adjusting mechanism adjusts the mold thickness by adjusting the distance between the movable platen and the suction plate. In this mold thickness adjustment, the gap between the movable platen and the suction plate is adjusted so that a predetermined gap is formed between the suction plate and the rear platen at the time of the mold touch in which the movable mold and the fixed mold touch. To do. A predetermined gap can be formed between the suction plate and the rear platen when the mold is closed, and a predetermined mold clamping force can be obtained when the mold is clamped. The mold thickness adjusting mechanism includes a screw shaft formed on the rod, a screw nut held by one of the movable platen and the suction plate, and a mold thickness adjusting motor that rotates one of the screw shaft and the screw nut screwed together. Have. The mold thickness adjusting mechanism may further include a screw nut held on the other of the movable platen and the suction plate.

This application claims priority based on Japanese Patent Application No. 2016-071610 filed with the Japan Patent Office on March 31, 2016, and the entire contents of Japanese Patent Application No. 2016-071610 are incorporated into the present application. ..

10 Mold Clamping Device 12 Fixed Platen 13 Movable Platen 15 Toggle Support 16 Tie Bar 18 Mold Clamping Force Detector 20 Toggle Mechanism 21 Crosshead 25 Mold Clamping Motor 26 Motion Conversion Mechanism 27 Torque Detector 30 Mold Device 40 Injection Device 50 Ejector Device 90 Control device

Claims (5)

An information management device for injection molding, which manages information of parts of an injection molding machine having a movable part, a drive part for moving the movable part, and a drive force detection part for detecting a drive force of the drive part. ,
An injection molding information management device for detecting deterioration of parts of the injection molding machine based on a detection value of the driving force detection unit while the movable unit is stopped. The injection molding machine includes a driving force acting unit that is distorted by the driving force of the driving unit, and a strain detecting unit that detects a strain of the driving force acting unit,
The information management device for injection molding detects deterioration of parts of the injection molding machine based on a detection value of the driving force detection unit and a detection value of the distortion detection unit while the movable unit is stopped. The information management device for injection molding according to Item 1. Of a part of an injection molding machine having a movable part, a drive part for moving the movable part, a driving force acting part distorted by a driving force of the driving part, and a strain detecting part detecting a strain of the driving force acting part An information management device for injection molding, which manages information,
An information management device for injection molding, which detects deterioration of parts of the injection molding machine based on a detection value of the strain detection unit while the movable unit is stopped. The information management device for injection molding sets, for each predetermined shot, a stop time of the movable part for detecting deterioration of parts of the injection molding machine during a molding cycle and/or between molding cycles. The information management device for injection molding according to any one of 1 to 3. A mold clamping device for performing mold closing, mold clamping, and mold opening of the mold device,
An injection device for filling a molding material into the mold device,
An injection molding machine comprising the information management device for injection molding according to claim 1.

Images